Electric battery.



UNITED STATES-PATENT onerou- EDWARD L. MARSHALL, OF'FREMONT, OHIO, ASSIGNOR, IBY MESNE ASSIGNMENTS, TO NATIONAL CARBON COMPANY, INC., AGORPORAT-ION OF NEW YORK.

, nnncrmc BATTERY.

Specification of Letterslatent.

I Patented be. 15, 1915.

No Drawing. Original application filed February 18, 1915, Serial 80. 9,185. Divided and thisappllcatlon- .dii'ision of my application filed February 18,

1915, Serial No. 9,185.

Dry cells consist usually of a zinc can with.

a central carbon electrode and a mix packed between the two. It is necessary to'keepthe depolarizer in the mix from reaching the A zinc can, and therefore it has been the praci even places in such linings, but it also acts as a diffusing body for the zinc salts termed during the action of the battery, Iwhereby crystallization cm the zinc is retarded or pro.

tice to gut a porous separating medium be tween t e zinc and the mix. This medium is made of cheese cloth in some cases, and of blotting paper, pulpboard or strawboard in others.

The porous medium also acts as a reservoir for the electrolyte, but inasmuch as all such bibulous linings orseparating mediums are of uneven surface, the zinc will not be in uniform contact therewith To make the contact uniform and secure equal. consun1ption ofthe zlnc along its entire surface, it

has been the practice to put cooked flour paste or cooked starch between the lining and the zinc, This not only fills in the un- I- have found'that-the paste in a dry cell slowly-diffuses through the lining'and gets beyond the region where it can perform its useful function. This causes the life of the cell toflbe shortened, both on shelf and in hrvice. Inv attempting to prevent this, I

hayeiiound that if the paste-is left in the filed March 7, 1916. Serial No. 82,733.

raw, uncooked condition, it diffuses much more slowly through the lining, and there-- fore it is retained in the desired place. Con

sequently the use of uncooked paste causes a remarkable increase in the shelf life and times add a small quantity of cooked paste to stiffen it and make it easier to handle. For this reason more or less of cooked paste can be'added if deslred.

ing and permitted. to dry. The paste lining 1s next placed -in the zinc can, wette The wet paste is next applied to a-drg-lin Q with wateror electrolyte and the cell is then finished .in the usual way.

While in the claims I have s ecified as the form of paste employe this is not intended as a disclaimer of the right to equivalents. v i I "Having described my invention, what I claim is 1. The method of lining a dry cell zinc can, which consists in applying wet paste to a cell lining, drying the flour paste and lining, and then placing the lining in the zinc can, y

. 2. The method of lining a dry-cell zinc can, whichconsists in applying wet, 'un

cooked flour paste to a dry lining, drying the paste and lining; and then placing the lining in the zinc can;

3. The method of lining a'dry' cell zinc can, which consists in applying wet, un-

cooked flour paste to a dry llning, drying the I paste and lining, placing the lining, in the zinc can and Wetting the dried. flour and, lining.

signature.

In testimony whereof I hereunto alibi my 

